Dentifrice



Patented June 21, 1927.

UNITED STATES PATENT OFFICE.

WINIOBD I. LARSON, F MINNEAPOLIS, MINNESOTA.

DENTIFBICE.

. ll'o Drawing.

. that it is possible to render the mouth bacteria and their products,commonly called toxins,-harmless by treatingfthem with a properly prepared castor oil soap.

' I have found that mouth bacteria, such as streptococci and pneumococci, are very sentitive to the action of a weak solution of castor oil soap. I have found that the Joacteria mentioned, which are universally present inthe mouths of hum-an beings, lose their power to cause infection after being treated for one minute,-often less,-with a one percent solution of castor oil soap.

I have found that the toxins produced by streptococci and certain other bacteria are instantly rendered non-toxic by treatment with castor oil soap.

The'soap acts upon the bacteria and their oisons by being adsorbed onto their surfaces which renders them harmless. In'preparing a tooth paste by my method I IDlX a solution of castor oil soa with an abrasive,-such as calcium car onate,--together with a binder and flavoring material' which makes it. more palatable, in such proportions that some free soap is present when a quantity of the tooth paste is dissolved 40 in a small, quantity of fiuid,such as saliva, when the paste is being used. This is of fundamental importance, since the castor oil soap will, as stated above, be absorbed onto the surface of any particle with i which it comes in contact. It is therefore necessary to satisfy all of the adsorptive requirements of the particles present, and still Application filed September 28, 1925.

Serial No. 59,284.

have enough free soap present to affect the bacteria and their poisons when used in the mouth.

Applicant is aware of the fact that there are now several tooth pastes on the market which contain soap. In these tooth pastes soap is used only'for its cleansing properties,

I have examined all of these pastes and find that none either destroy the mouth bacteria or their toxins.

The reason castor oil soap acts differently from other soaps in this respect is the fact that castor oil contains practically no fatty acids other than ricinoleic acid, and therefore a castor oil soap is very soluble.

Ordinary soaps, on the other hand, contain-large quantities of stearic and palmitic acids, whose soaps are insoluble in water at ordinary temperatures. The result-is that these insoluble soaps adsorb onto their surfaces, the soluble ones, and the latter are not free to act upon bacteria and their toxins.

I claim as my invention:

1. A dentifrice containing castor oil soap.

2. A dentifrice comprising a suitable vehicle and castor oil soap mixed therewith.

3. A dentifrice containing the soap of an unsaturated fatty acid.

4. A dentifrice containing the soap of an unsaturated fatty acid mixed with abrasives and flavoring materials and capable when used of detoxifying bacterial toxins existing in the mouth of the user.

5. A dentifrice composed of a solution of the soap of an unsaturated fatty acid'in a dental cream article forming a pasteand capable when. used of detoxifying bacterial toxins existing in the mouth of the user.

6. A dentifrice containing a solution of castor oil soap in a dental cream article forming a paste and capable when used of detoxifying bacterial toxins existing in the mouth of the user.

In witness whereof, I have hereunto set myhand this 25th day of September, 1925.

WINFORD P. LARSON.

Certificate of Correction. Patent No. 1,633,336. Granted June 21, 1927, to WINFORD P. LARSON.

It is hereby certified that error appears in the printed specifioation'of the abovenumbered patent requiring correction as follows: Page 1, lines 43 and 44, for the Word absorbed read adsorbed; and thatothe'said Letters'Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice,

Signed and sealed this 18th day of October, A. D. 1927.

[SEAL-1 M. J. MOORE,

Acting Commissioner of Patents. 

